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What savings can be expected from CICS V4 temp storage tuning changes?

I'm trying get management to support making some CICS V4 temp storage tuning changes. To a couple of us these are...

no-brainers, but where we're having difficulty is to be able to say what savings can we expect to see as the result of these tuning changes. Our non-production regions don't have enough activity to really get any figures to publish. Here's one example of a heavily used CICS V4 region........what we see today.......and what I plan to do:

Note I'm getting the stats from Omegamon CICS:

Please don't chuckle!

CIMACPR7 is the region.
4K CI for temp storage
PUTs > CI size . . . . : 125444
TSGID=4
TSGID extensions = 53,477
Unit table compressions = 1,123,098
Total Q's created = 1,666,984
Items in Q (HWM) 29,487
Longest aux item = 32,787
Temp storage buffers/strings are 64,4

What I plan to do:
TSGID=100 (to start)
Temp storage CISIZE 8K to start then
evaluate (also increase the size of the temp storage dataset by 1/3).
Buffers/strings increase to 100,50 and evaluate.

Can you give me any ammunition?

Based on what I have read and seen in test regions, I am going to possibly decrease DSA utilization, increase thruput, and possibly decrease transaction response time for transactions that use temp storage (and possibly on other transactions too). Can I expect to see any cpu savings? Any negative impact to be expected? What do you think........If I make the changes as specified, I can't think of any.

Your opinion and recommendation is appreciated. We've got about 10 CICS V4 regions in this same condition and with similar volume, so I really feel we have an opportunity to effect some savings here.


I am afraid I cannot quantify what any gains might be. The only thing I can say is that the given the current Temporary Storage statistics, the proposed changes are in-line with tuning recommendations. I cannot really see that it would have any negative impact unless you are already severely storage constrained.


This was last published in February 2002

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